Power shovel



June. 3, 942- A. A. WALDECKER 7,

POWER SHOVEL Filed Feb. 20, 1941 '3 Sheets-Sheet 1 INVENTOR 17/822?hlacien Y M 7&4?

ATTORNEY Julie 23, 1942. A. A. WALDECKER POWER SHOVEL Filed Feb. 20,1941 3 Sheets-Sheet 2 a n .8 l i #2. w J m vm .3. m o l w M ,W/|| W J Iu. H n W a t Z M a h i M W 0 J a v 5 :i 5. 4% iv w June 23-, 1942. A. A.WALDECKER. 2,287,152

POWER SHOVEL Filed Feb. 20, 1941 3 Sheets-Sheet 3 v INVENTOR I Iflzleclex A'ITQRNEYQ Patented June 23, 1942 ili li zgsnsz s as rice 8Claims.

, This invention relates to power shovels such, for example, as powershovels adapted to be attached to and operated by the power drivenmechanism of a farm tractor of any conventional construction. The powershovel in accordance with the present invention is adapted to beoperated mechanically, hydraulically or electrically, dependent upon thetype of motive power which is employed to drive the tractor to which itis attached.

One of the objects of the present invention is to provide an improvedpower shovel of the foregoing type which is capable of collecting,elevating, transporting and dumping relatively heavy loads of loosematerials of various kinds.

A further object of the present invention is to provide an improvedpower shovel attachment for application to a tractor of standardconstruction and one in which the load shovel is supported andcounterbalanced in a manner which prevents any possibility of tippingover of the tractor to which it is attached.

Another object of the present invention is to provide an improved powershovel of the foregoing character which is capable of being attached toa standard tractor without the necessity of remodeling or reorganizingthe operative parts of the tractor to which it is attached.

A further object of the present invention is to provide means formechanically elevating or lifting the shovel by means of the force orpower for driving the tractor and manual means for releasing or trippingthe shovel proper to dump the load at any desired point or place.

Another object of the present invention is to provide an improved powershovel and associated mechanism which, when applied to a standard typeof tractor, is of such a nature that the tractor with the power shovelattached thereto may be placed upon a truck and transported from placeto place; and one in which the overall height of the tractor and powershovel mechanism when in position on a truck is of minimum height, thuspermitting the tractor to be transported over the highways and beneathviaducts on the truck without necessitating dismantling of the powershovel from the tractor which supports it. 1

The foregoing and other objects and advandesignate corresponding partsin the several views.

In said drawings:

Fig. 1 is a perspective view of one embodiment of power shovel inaccordance with the present invention, shown applied to a four wheeltype of farm tractor.

Fig. 2 is a perspective view of the structure of Fig. 1. showing thepower shovel in elevated position.-

Fig 3 is a longitudinal elevational view of the structure shown in Figs.1 and '2.

Fig. 4 is an enlarged horizontal sectional view taken substantiallyalong the line 4-4 of Fig. 3, looking in the direction of the arrows.

Fig. 5 is a front elevational View, partly in section, takensubstantially along the line 55 of Fig. 3, looking in the direction ofthe arrows.

Fig. 6 is an'enlarged fragmentary rear elevational View, takensubstantially along the line 6-4; of Fig. 4, looking in the direction ofthe arrows.

Fig 7 is an enlarged top plan view partly broken away, takensubstantially along the line 1-1 of Fig. 3, looking in the direction ofthe arrows.

Fig. 8 is an enlarged sectional View taken substantially along the line88 of Fig. '7, looking in the direction of the arrows.

Fig. 9 is a sectional view taken substantially along the line 99 of Fig.7, looking in the direction of the arrows.

Fig. 10 is an enlarged sectional View taken substantially along the lineIii-I0 of Fig. 3, looking in the direction of the arrows.

Fig, 11 is an enlarged detail sectional view, taken substantially alongthe line I l -H of Fig. 4, looking in the direction of the arrows.

Fig. 12 is an elevational view, partly in section, taken substantiallyalong the line 12-42 of Fig. 3, looking in the direction of the arrows,and showing the back end of the shovel.

Fig. 13 is a vertical sectional View taken substantially along the linel3i3 of Fig. 12, looking in the direction of the arrows.

Fig. 14 is an enlarged detail sectional view taken substantially alongthe line I l-l4 of Fig.

tages of the present invention will appear from the followingdescription and appended claims, when considered in connection with theaccompanying drawings forming a part of the present specification,wherein like reference characters 4, looking in the direction of thearrows.

Fig. 15 is an enlarged fragmentary detail sectional view, partlyinelevation, taken substantiallyalong the line I5-I5 of Fig. 3, looking inthe direction of the arrows; and

Fig. 16 is a view' similar toFig; 13 and showing a somewhat modifiedshovel structure embodying the present invention.

Before explaining in detail the present invention it is to be understoodthat the invention is not limited in its application to the details ofconstruction and arrangement of parts illustrated in the accompanyingdrawings, since the invention is capable of other embodiments and ofbeing practiced or carried out in various ways. Also it is to beunderstood that the phraseology or terminology employed herein is forthe purpose of description and not of limitation.

Referring now particularly to the drawings, the power shovel andoperating mechanism therefor, as well as the supporting frame and otherportions of the power shovel structure are shown as applied to a farmtractor indicated as a whole at 23. The engine of the tractor isprovided with a crankcase I9 and the tractor has a pair of front wheels2| and a pair of power driven rear wheels 22. The front wheels 2| aresupported upon a front axle 23 having spindle housings 24 and the rearwheels 22 are supported by a rear power axle shown as a Whole at 33.

Referring particularly to Fig. of the drawings there is shown a bearingsupport or plate 25 having upturned side end portions which engag theside walls of the crankcase IS. The lower end of the bearing support 25is preferably bifurcated or U-shaped to support a roller 26 mounted upona horizontal pin 21. The pin 2'! supports the roller for rotation.

A truss rod comprising sections 23 and 29 whose adjacent inner ends areconnected together by means of a turnbuckle 36 is provided for thepurpose of holding the front wheels 2| of the tractor in their properpositions and thus preventing them from spreading at the bottom underloads. The outer opposite ends of the truss rod sections or portions 28and 26 carry U-shaped or loop-like clamps 3i and these clamps are heldin engagement with the spindle housings 24 by means of bolts or the like32.

The power shovel unit of the present invention is adapted, as statedabove, to be applied to any conventional type of farm tractor andconsists of a shovel or scoop and supporting framework which may beapplied or adapted to the tractor and secured thereto without in any waynecessitating the reorganization of the tractor construction.

The rear axle 33 of the tractor is of conventional construction but isprovided, as shown, with a downwardly projecting housing portion 33a forthe purpose of housing a rearwardly extending or projecting short driveor jack shaft 331) to the outer end of which is attached a sprocket orother gear member 330.

The frame structure or harness of the socalled power shovel unit orattachment for the tractor is adapted to be attached to and supported bythe transversely spaced longitudinally extending articulate framemembers of the tractor, which, as shown, are composed of a pair of rearsections or portions 36 and a pair of forward sections or portions 37.As shown, these frame members 36 and 31 are preferably of channelformation. The rear frame members or sections 36 are preferably attachedto the rear axle structure 33 by means of angle plates 34, seeparticularly Figs. 3, 4 and 6, which are held with relation to the axleby means of bolts 35. These bolts 35 serve also to support the fendersF, see particularly Figs. 1 and 2, for the rear wheels 22. The uprightleg or portion of the angle member 34 is secured to the rear. channelframe member 36 in any suitable manner, as by means of bolts Me. It isto be noted, with particular reference aaezisz to Fig. 6 of thedrawings, that the channel member 36 is reinforced by a filler 36a togive additional strength to this frame member at certain points in itslength.

As clearly seen in Figs. 3 and 15, the adjacent ends of the framesections or portions 36 and 31 are slightly spaced apart and arepreferably pivotally secured together by means of plates 38, the platesbeing located on opposite faces of the webs or upright portions of thechannel members 36 and 31. The rear portions of the plates 38 arerigidly secured to the rear frame member 36 by a pair of bolts 39 andthe forward portions of these plates are pivotally attached to the webof the frame member 31 by a single bolt 4. Thus, it will be seen, thatthe frame sections 31 may move or pivot relative to the sections 36.

As best seen in Fig. 5, a steel hanger or support 4| in the form of apiece of twisted strap steel is fastened at its upper end by a singlebolt lla to the front axle 23. The lower end or portion of the strap orhanger member 2i is secured by a single bolt to the outer face of theweb portion of the front frame section 3'5. The point of supportingconnection between the front axle and the frame member 3'! is located ashort distance rearwardly of the forward end of the frame member 3'1. Asseen in Fig. 5, one such supporting or connecting strap member or hanger4| is provided at each side of the frame. Substantially Z-shapedsupporting members or brackets 32 are connected to the outer faces ofthe web portions of the longitudinal frame sections 3'! by single bolts43 and to the upright leg portions of an arched or invertedsubstantially U-shaped frame or boom supporting member shown as a wholeat 44. This arched member 44 is, as shown, in the form of an inverted Uhas an upright transversely spaced leg portions each of which isconnected in like manner by the substantially Z-shaped member 2 to theforward end portion of a frame section 3?. The upper end of the U-shapedframe member 1-4 provides an arched or curved surface 45 which isadapted to be engaged by and provides a track for spaced rollers 46.These rollers 36, as shown, are carried by a yoke-like supporting memberwhich is shown as a Whole at All and which will be described in detailhereinafter. As best seen in Figs. 4 and 5, the leg portions of themember 44 are rectangular in cross section from their lower ends topoints adjacent the arched or curved upper portion of the frame member,the said arched or curved portion being shown herein as of channelformation with the rollers engaging the web portion 45 of the channel.It will be understood that by virtue of the rollers and the rollingcontact of the member 61 with relation to the arch-shaped member 44 thattilting movement laterally of the member 43 will not affect the positionof the member 41. This is an important feature of the present inventionsince it is desirable to maintain the boom supports and othersuperstructure of the power shovel attachment or unit in fixed verticalor upright positions at all times regardless of the uneven surfaces overwhich the tractor is travelling. The advantage of this will be apparentfrom the following description relating to the structure.

The inverted U-shaped frame structure 4L. also provide means forsupporting a guard shown as a whole at 48. This guard is, of course,provided to protect the radiator core and other front end structure ofthe tractor 26.

As best seen in Figs. 2 and 3, the rear or inner longitudinal framemembers or sections 36 are preferably extended rearwardly beyond therear axle 33 and the rear wheels 22 to provide a support for acounterweight shown as a Whole as a box-like structure 59. It will beunderstood that one purpose of this counterweight G is to maintain thetractor and the power shovel attachment in balance when the power shovelis operated and elevated with a load. The counterweight structure 50likewise provides a convenient tool box for the tractor. Fig. 2 showsthe counterweight and tool box 53 as being substantially T-shape inhorizontal cross section. It will be understood, however, that thismember 56 may be of any desired size, shape or weight. In the event thatadded weight is needed to counterbalance the power shovel during thehandling of extra heavy loads, the box-like container 52 provides meansfor receiving more counterweight.

The frame members 38 on opposite sides of the structure are provided inadvance of the rear axle 33 with upright brackets or supporting members5|. These brackets or supporting members are preferably attached to theframe members 3% by means of bolts, rivets or the like, and providesuitable supports or bearings for the inner ends of longitudinallyextending booms or so-called boom sticks or members, shown as a whole at52. With particular reference to Fig. 3 of the drawings, it is to benoted that the booms or boom sticks 52 are pivoted at 53 to the brackets5i and that they extend forwardly throughout a portion of their lengthin a substantially horizontal plane when the shovel is in its loweredposition. At a point in advance of the frame member i and the guard 48,the boom sticks extend downwardiy toward the ground. These downwardlyprojecting portions of the boom sticks 52 are shown as a whole at 53.The forward end of each of the members 53 terminates in a horizontallyextending portion 54, this portion normally extendirg in a plane whichis substantially parallel to the plane of the portion 52 of the boomsticks. The boom stick portions 52, 53, 5 1 are preferably of channelformation as clearly seen in Fig. 12 of the drawings although it will beunderstood that they may be formed of any desired cross section. The endportions 5 3 of the boom sticks together provide bearings for receivingand supporting a transversely extending pivot or rock shaft 55 which isattached to the opposite walls 59 of a shovel or bucket, shown as awhole at to.

The bucket to is, as shown, provided with end walls 59, a rear wall 5!and a partial bottom wall or floor 62 which, as shown, toward itsforward end, is curved downwardly and forardly at 53. The base or bottomof the bucket $53, in addition to the solid floor or base portion E32,63, is provided with a plurality of teeth 35, five such teeth beingshown in the drawings, merely by way of illustration. It will beunderstood, however, that any desirable number of teeth may be employed,this number being dependent upon the type of material which the powershovel bucket is adapted to be used with.

As will be readily understood, the bucket 60 is pivotally mounted bymeans of the shaft 55 so that it can tip forwardly about said pivotconnection. It is to be noted that the bottom faces or surfaces 55 ofthe bucket teeth and the bottom surfaces of the channel frame portions54 extend in substantially the same plane so that when the boom sticks52 are in their lowered position as best seen in Figs. 1 and 3 of thedrawings, the bucket per so will "rest flat upon the ground. Thus, inuse, the bucket will remove material from the actual surface of theground. This fiatwise resting position of the bucket is made possible byreason of the fact that the floor portions 62, 63, are disposed abovethe bottom or lower edges of the end or side walls 59 of the bucket.

The rear wall of the bucket is preferably provided with a short anglebar H which is fastened to the bucket wall in any suitable manner as bywelding or riveting in place. The rear wall 6| of the bucket is providedadjacent one end thereof with an eye or other suitable projection 66 towhich the end of a cable 61 may be attached. As seen in Figs. 3, 4 and14, the rear or inner end of the cable 6'! is preferably attached to acoiled tension spring 68 which, as shown, is mounted in a housing 69carried by or attached to the boom stick portion 52 at the right side ofthe tractor. The rear end of the coiled spring 68 is attached at It toan eye bolt or other member carried by the boom stick. The purpose ofthe cable 61' and the attached spring 68 is to maintain the cable undertension and taut as shown in Fig. 13. The tendency of the cable and thetension spring is to maintain the bucket 88 normally in its uprightposition as shown in Figs. 3 and 13.

Referring now particularly to Figs. 12 and 13 of the drawings, it willbe seen that the bucket or shovel 6E? is maintained in its upright orhorizontal position by a pivoted latch member 72 having a cutout ornotched portion providing a hook-like member which engages the angle 1|carried by the rear wall 6| of the bucket. The transverse channel memberor bar 54a. carries a pair of spaced upright angle members 13 betweenwhich the pivoted latch member is mounted by means of a pin or pivot M.The upright angle members 73 carry a transverse short angle 15 which isattached to the members l3 by welding or in any other suitable manner. Arearwardly and upwardly extending metal bracket member i6 is attached tothe angle 15 and serves as a support for one end of a tension spring H.The opposite end of the spring 11 is attached to the upper end of thelatch member 72 and since the spring is under tension, the latch memberis normaly held in its full line position, as shown in Fig. 13 and withthe hook or notched portion thereof engaging the angle member ll on thebucket wall.

The cross frame member or channel Ma supports an upright metal bracket'18 which has its lower end portion bent at right angles and secured tothe frame member Ma. A similar upright bracket or supporting member 19is provided adjacent the latch 12 and the angles 13 and likewise has itslower or bottom end turned rearwardly at substantially a right angle andsecured to the frame member 54a. The purpose is to provide two uprightsupports which are spaced rearwardly from and are independent of thebucket 68. As seen in Fig. 13, each of these upright supports 18 and I9provide one portion of a bearing or journal for a transversely extendingshaft 8! As shown, this shaft extends inwardly from the left side wallof the bucket to a point beyond the centerthereof and is held insubstantially horizontal position by means of U brackets or strapmembers 8| which are bolted or otherwise secured to the upright brackets13 and T9 to provide the other parts of the spaced bearings or journalsfor the shaft 80. The outer end of the shaft, at the left of Fig. 12,has a right angularly disposed portion 89a to which a pull rope or thelike 82 is attached. The main portion of the shaft 80 is preferably outof round, particularly at the point in the shaft which is locatedopposite the pivoted latch member 12. This out of round portion of theshaft is shown at 8% in Fig. 13. The shaft 89 extends transversely ofthe machine behind the bucket or shovel 5t and is positioned above theangle 15. It will be understood that when the rope 80 is pulled by theoperator, the offset end Bila of the iaft will rotate the shaft in acounterclockwise direction and the cam portion 8% thereof will force thepivoted latch '12 from its full line position to its broken lineposition of Fig. 13, thus releasing the hooked portion or nose of thelatch from engagement with the angle H. Therefore, if the bucket 88contains a load of material and is in elevated position above theground, the weight of the load will tilt or tip the bucket about itssupporting pivot 55 against the action of the tensioned cable 6?. Afterthe load has been dumped, the tensioned cable 61 and the spring 63 towhich it is attached, will tend to return the bucket 60 to its originalhorizontal or upright position. In moving into such position, the anglemember 79 will trip the latch 12 and the spring I? attached to the latchwill force the hooked end or notch therein into engagement with theangle H to lock the parts together, as shown in Fig. 13.

Referring now particularly to Figs. 1, 2 and 3, the power shovel unit isprovided with a pair .of boom stick supports which are located above thelongitudinal frame members 3i,- and 33' and also above the boom sticks52. As best seen in Fig. 3, the boom supports 85 are pivotally mountedat their inner or rear ends by means of pivot pins, belts or the like 8ito upright brackets 82 which, as shown, are secured to the frame members3'3 by bolts, rivets or the like. It is to be noted that the supportingbrackeis 82 are positioned adjacent to but at the rear of the rear axle33. As best seen in Figs. 1 and 2, the boom supports 85 extend forwardlyand upwardly in parallel or substantially parallel relation to thepoints 85a. From the points 85a the boom supports converge toward oneanother to the points 85?) and then extend forwardly in a substantiallyhorizontal position to provide the forwardly extending portions 850. Theboom supports 85 may be of channel formation and at a point adjacenttheir forward or free ends the lower flanges of the channels are removedto provide an opening Std as clearly shown in Fig. 10. The upper flangesof the channel members are in abutting relation. The upright portions orwebs of the channel sections 25c provide bearings for a transverse shaft$3 whose ends are fixed to the webs. This shaft carries a twin pulleydevice 87 which is rotatably mounted on the shaft above the opening8501. The forward ends of the cooperating channel portions 850 arefilled by a metal block 88, see particularly Fig. 1.

The sections 850 of the boom supports carry a depending so-called twinfair lead or guide device shown as a whole at 89. The fair lead or guidecomprises a depending substantially U- shaped bracket 93 secured to thechannel sections 850 and supporting the rear ends of longitudinallyextending short shafts 95. The forward ends of these shafis Si aresupported by a depending hook-like member or bracket 92 whose upper endis secured to the block 88 and whose lower end is provided with an eyeor opening to receive a transversely extending bolt or pin whichsupports the forward ends of the shafts 9 I Each shaft 9| is providedwith an antifriction roller 53, see particularly Fig. 10.

The boom supports are preferably maintained in their normal positions bymeans of the yoke-like frame member shown as a whole at i! andpreviously referred to. As clearly seen in Figs. 1, 2 and 5, theyoke-like member il has a base portion consisting of a web portion andfront and rear depending walls 96, this base portion being substantiallyin the shape of an inverted U in cross section. As previously stated,the base portion carries rollers 66 which are adapted to engage the webof the frame member 44. The base portion 95 is removably supported uponthe top of the frame member 44 and is held in place by means of aremovable pin .or bolt 91 which passes through the front and rear wallsor portions 96 of said member and which is disposed on the opposite sideof the arched portion of the frame 45 from the rollers 46. The yokelikemember 47 has a pair of upwardly extending converging arms or members 98which together provide a substantially A-shaped frame. The upper ends ofthese members 98 are secured to the boom support sections 850 by meansof a belt or the like 89.

The boom supports 85 together with the mechanism to be hereinafterdescribed provide means for the raising and lowering of the boom sticks52 and the shovel or bucket Ell.

Referring particularly to Figs. 1, 4 and 11, it will be seen that thesections 53 of the boom sticks are interconnected by means of atransverse skeleton frame structure which comprises, as shown, a pair.of parallel transversely extending channel members ifiil which arewelded or otherwise secured to the boom sticks and which carry at spacedpoints metal plates or platforms IBI. Referring particularly to Fig. 11,each of the platforms or plates Ifil supports a pulley housing I32 whichcarries a pulley or roller I03. The pulley housing i022 is mounted uponthe platform and is secured thereto by means of a depending bolt IMwhich is surrounded by a cushioning coil spring H15 disposed below theplate lill, the bolt and spring being held in position by a nut I06.

The frame members 55; and 1 are maintained in their relative upright orsubstantially vertical positions by means of a bar or rod HQ, seeparticularly Figs. 1 and 7, whose rear or inner end is secured at Ill toa transverse frame member supported by the boom supports 85. The forwardend of the bar IE5 is preferably flattened and provided wiih a series ofholes or openings which are adapted to register with a verticallyextending pin or stud H2 carried by the base plate 95 of the framemember 1. The front end connection of the bar or rod H8 may be clearlyseen in Fig. 5. The front end of the bar H6 is held in position withrelation to the pin by means of a cotter pin or key or in any suitablemanner so that the bar or rod may be detached from the pin and the framestructure 4].

Referring now particularly to Fig. '7 of the drawings, there is showntherein, in detail, the power operated mechanism for raising andlowering the boom sticks 52 and the shovel or scoop 69. As shown, thismechanism is supported by means of asuitable frame structure whichcomprises a cross bar H5 whose opposite ends are bolted or otherwisesecured to the boom supports 85, a brace bar or rod H6 whose oppositeends are attached to the webs of the boom supports 85, see also Fig. 2.The bar or rod H6 and the cross bar IE together provide brace membersfor the boom supports 85 and the bar H6 also provides means forattaching the inner end of the rope or cable 82 which is used to releasethe shovel or scoop 68 at predetermined times.

The power operated mechanism for raising and lowering the boom sticksand the shovel is, as shown, see particularly Figs. 7, 8 and 9, mountedupon a, transversely extending power driven shaft III. This shaft isJ'ournalled at its opposite ends in suitable bearing I I8 carried by orforming a part of the boom supports 85. The shaft II! is also journalledor supported intermediate its ends by additional bearings I I9 whichbearings are attached to longitudinally extending brace members orbrackets I20 which are attached, as by means of bolts to the cross bar II5, as shown in Fig. '7. Thus, the power driven shaft III is firmlysupported for rotation when power is applied thereto.

A twin cable winding drum, spools, or the like, shown as a whole at I2|, is rigidly mounted upon the approximate central portion of the powerdriven shaft II! and is, as shown, located between the bearings H9. Whenthe power driven shaft II! is driven or rotated in a counterclockwisedirection, the twin drum is likewise rotated in a counterclockwisedirection to wind onto the sections of the drum the cables I22.

It will be understood that a separate cable I22 is provided for eachhalf or section of the twin drum structure I2I and that one end of eachcable is attached, in any suitable manner, as by means of cable clampsto the structure adjacent the twin pulley device 81, see particularlyFig. 10. The cables I22 extend around the pulleys Hi3 mounted upon theplatforms II?! and extend upwardly and over the twin pulley device 8'!and rearwardly to the sections of the twin drum I2I. The opposite endsof the cables I22 are attached to the sections of the drum in anysuitable manner. Thus, when the drum I 2| is rotated or driven in acounterclockwise direction by virtue of applying power to the powerdriven shaft III, the boom sticks I52 and the shovel 69 are elevatedtoward the twin pulley device 81. This action will, of course, shortenthe stretches of cable between the pulleys I62, ms and the twin pulleydevice 8'! by reason of the fact that as the drum I2I rotates the cablesWill be wound Onto the drum. The stretches of cable from the twin pulleydevice to the drum I2I diverge and as best seen in Fig. 1, extendbetween the opposed frame members or boom supports 36.

The power driven shaft II'I supports adjacent its right end as shown inFig. 7, a clutch device which is shown as a whole at I25, seeparticularly Fig. 9. The clutch device I25 may be of any suitable kindand, as shown, comprises a friction type of clutch having an innerdisk-like member or block I26 and a cup-like housing having an annularflange I21. The inner clutch member I26 is, as shown, mounted upon thepower driven shaft I I! to be rotated with said shaft. Spring pressedball bearings I28 are located in spaced pockets or cutout portions I29in the block or member I26 and are interposed between said block and theflange I 21. Coil springs I38 are located in the spaces I29 and supportthe ball bearings I 28. The opposite ends of the springs engage fixedstops or lugs ISI which are rigidly attached to the clutch disk ormember I26. It will be understood that the parts of the clutch hereindescribed are more or less of standard construction and while a certaintype of clutch has been disclosed herein, it will be understood that anysuitable type of clutch might be used with the power operated liftmechanism of the present invention. It will be understood that with theparts in the positions in which they are shown in Fig. 9, when the powerdriven shaft I I I is rotated or turned in a counterclockwise directionas indicated by' the arrow in this figure, the clutch disk or block I26,the balls I28, the springs I30 and the stops or lugs I3I will revolve asa unit while the clutch housing including the flange I27 will remainstationary. When the shovel 68 has been elevated and the powerdisengaged from the lift mechanism, the weight of the load in the shoveltends to turn the shaft II! in the opposite or clockwise direction. Thiswill turn the clutch member I26 in the same direction. Upon so turning,the ball bearings or rollers I28 will be wedged between the inner memberI26 and the flange I2! of the clutch housing to lock or bind the partstogether and prevent the accidental or unauthorized lowering of theshovel 60. To lower the shovel, it is necessary to release the externalbrake band, to be described below, which allows the clutch member I26and the clutch housing I21 to rotate as a unit with the shaft I I1.

As shown in Fig. 9, an external type of band brake or the like I33 isemployed to engage the flange I2! of the clutch housing. This band brakeI 33 is provided with conventional brake lining I34 and the oppositeends of the brake are mounted upon supporting pins I 35 carried by abracket member I36 which is pivotally mounted at I31 to the framework ofthe machine. The band brake may be contracted and/or released by meansof a hand lever shown as a whole at I 30. This hand lever I46 as shown,extends rearwardly in a substantially horizontal plane toward theposition where the operator of the tractor is seated and has its inneror rear end turned downwardly at MI to provide a hand gripping portionfor the lever. The brake I33 is maintained in braking position relativeto the clutch by means of a tension spring I 42. One end of this springis attached to the clutch release lever and the opposite end to the boomsupport or frame member 85. The purpose of this spring is to maintainthe brake applied at all times except when the hand lever is lifted oroperated to release it. It will be understood that other types of brakemechanism may be employed within the purview of the present invention.

It is, of course, desirable to provide guard members or shields for thetwin cable drum I2I and also for the clutch and brake structure.Therefore, sheet metal or other shield members I43 and I :33,respectively, are provided. As shown, these shields or guards arepreferably attached to the cross bar H5 and extend rearwardly anddownwardly over the twin drum and the clutch and brake units. Theseshields may, however, be mounted or supported in any other suitablemanner. The shield I23 serves an important purpose in that since thecable winding twin drum IZI is mounted directly in front of the operatorof the machine, it is desirable to prevent any possibility, should acable break, of the end thereof coming in contact with the operator. Eyreason of providing the shield I53 such danger is entirely overcome.

Referring further to Fig. '7, it will be seen that a ring gear M isrigidly mounted on the shaft II! for rotation therewith. As clearlyshown in Fig. 8, this ring gear M5 is in constant mesh with a beveledpinion gear I46 which is mounted upon a vertically extending powerdriven shaft I ll. The lower end portion of the shaft It? has, as shownin Fig. 6 at Its, a square cross section and is adapted to fit into asimilarly cross sectioned tube or sleeve member I49. This tube I49extends downwardly and into a gear box I50 which, as shown, is mountedagainst the inner face of the longitudinal frame member 36 at the pointin said frame member where the frame is reinforced by the block orreinforcing member a, see particularly Fig. 6. The

gears in the gear box I may be of any desirable construction such forexample as a bevel pinion mounted on the lower end of the tube I49 whichmeshes with a similar pinion mounted on the inner end of a shaft I5I.the outer end of the shaft I5I carries a sprocket or gear I52 with whichthe sprocket chain I53 meshes. This sprocket chain I53 serves tointerconnect the driving sprocket or gear 330 with the driven sprocketor gear I52 when the transmission mechanism is operated to drive theshort shaft 332). It is, of course, desirable to maintain the sprocketchain I53 taut and to remove any slack therein. For this purpose, I haveprovided a depending bracket or the like I54 which carries U at itslower end a roller I55 which is adapted to engage the outer edges of thesprocket chain I53. It will be understood that by adjusting this slacktake-up device, the chain will be kept taut at all times.

Referring now particularly to Fig. 4 of the drawings, there is providedadjacent the gear box I5!) previously described, a clutch casing orhousing I50. This housing contains a positive clutch for throwing in andout of mesh the take-off drive from the rear end of the differential,namely, that which comprises the gears 33c and IE2, the sprocket chainI53 and the horizontally extending shaft I 5| With reference to thisfigure, it will be seen that the shaft IEI extends forwardly and intothe clutch housing IE9. A suitable clutch lever IBI is provided andextends upwardly into position to be easily grasped by the operator ofthe tractor. The positive clutch mechanism and the lever for actuatingit may be of any desired conventional construction.

The gears I45 and I 35 are shielded by means of a cover member or plateI59 whose forward end or edge is attached to the cross bar H5 and whichextends rearwardly and downwardly so as to cover the gear M5 as well asthe gear I45. Thus, all of the moving parts of the power operated liftmechanism are covered by safety shield members.

By virtue of providing the telescoping shaft I48 and the tube I49 whichhave cooperating squared cross sections, it is possible to elevate theboom supports 85 relative to the longitudinal frame members 36 and 31 ofthe power shovel unit. Moreover, by virtue of the fact that theso-called A-shaped frame 41 may be released from its position, as shownin the drawings, and separated from the frame member 44 by simplyremoving the cotter pin or key from the stud or pin H2 and by releasingthe longitudinal bar or rod I If! and also by removing the locking pin9?, see Fig. 5, the superstructure of the machine, namely, the boomsupports 85 and the frame E1 and attached parts, may be lowered relativeAs seen in this figure,

to the frame 44 and the tractor itself. This is desirable to permit thetractor and its attached power operated shovel unit to be transported ona truck. By being able to release the superstructine and lower it withrelation to the lower portions of the structure, as described, it willbe understood that the overall height of the tractor with the attachedpower shovel unit mechanism will be greatly reduced. It is to beunderstood further, that the entire unit, namely, the power shovel andthe means for operating it, may be dismantled from the tractor in arelatively short space of time if this proves desirable.

Referring now particularly to Fig. 16 of the drawings, there is shown inthis figure a somewhat modified type of power shovel, scoop or bucket.In the present form of the invention, the bucket per se is substantiallylike that shown at Gil in the preceding views but, in addition to thestructure previously described, is provided with a removable plate orfalse bottom I5lla which is secured to the underfaces of the teeth ofthe shovel by bolts and nuts I5Ia. The inner or rear edge of the plateI5Ia is provided with struck-up portions or fingers I52a, some of whichextend above the adjacent surface or floor portion 53 of the shovel andothers beneath this portion of the floor. It will be understood that theplate is slipped into position beneath the teeth a: and the alternatefingers or portions I52a brought into engagement with the floor portion63. The bolts and nuts I-5I'a are then applied to attach the removablefloor or plate portion Hit-a to the shovel. This particular type ofshovel has the advantage of adapting the power shovel structure for usein collecting loose material, such as dirt, and with the present form ofthe invention, the machine may be employed to remove material from asurface in substantially the same manner as hand shovels and broomswould be employed for this purpose.

From the foregoing, it will be seen that I have described a preferredand improved form of power operated or driven mechanism for actuating apower shovel, the source of power being derived from the tractor orother machine to which the shovel and its associated parts and mechanismare attached.

The operation of the power shovel or attachment embodying the presentinvention is substantially as follows:

With the power shovel 6G in its lowered position, as shown in Figs. 1and 3 of the drawings, the operator depresses the clutch pedal of thetractor, moves the clutch control lever IiiI with the transmission gearshift lever IS in neutral position to throw into mesh the jack shaft33b. Thus, by driving the differential mechanism of the rear axle 33,the sprocket chain I53 drives the sprocket I52 and rotates thehorizontal shaft I5I which in turn imparts a rotative motion or movementto the telescoping shaft and tube I48 and I49, respectively, to drivethe bevel pinion gear I46 and the ring gear I45 to rotate the shaft II'Iin a counterclockwise direction. This rotation of the shaft in turnrotates the clutch mechanism shown in detail in Fig. 9 and also rotatesthe twin drum I2I to wind the cable I22 and elevate the boom sticks 52,53 by drawing up the cables to lift the power shovel 60 to a positionsuch as that shown in Fig. 2 of the drawings. When the shovel and its'load have been elevated to this position, the rope or cable 82 is pulledto release the latch I2 and the weight of the material in the shovel 60will tip it about its pivotal point or shaft 55 to dump the load. Whenthe shovel is in elevated position the clutch mechanism I25 maintainsthe cables I22 taut to hold the shovel in such elevated position. Itwill be understood that the band brake I33 is in gripping engagementwith the flange or wall I21 of the clutch housing or member and thus theshovel will not return to its lowered position. After the load has beendumped from the shovel, the brake release lever I49 may be operated torelease the brake and the weight of the shovel will lower it to itsoriginal or ground position or to any point between its upper and lowerlimits, the position to which it is lowered being determined by themanual control of the band brake. During this lowering movement and asthe teeth of the shovel touch the ground, the shovel will be tippedrearwardly to its normal locked position at which time the latchactuating spring ll returns the latch '12 to its locked position, asshown in Fig. 13.

The power shovel may be easily operated and controlled by means of thevarious instrumentalities described above and it is to be noted that themeans for controlling the operation or actuation of the shovel are alllocated within convenient reach of the operator of the tractor.Moreover, as stated above, the improved power shovel unit or structureof the present invention may be easily applied or attached to aconventional tractor or other similar machine without necessitating thereorganization of the tractor or its component parts.

I claim:

1. A power shovel unit adapted to be mounted upon a tractor and operatedthereby, comprising articulated longitudinal frame members detachablyconnected to the front and rear axles of said tractor, a pair of boomsticks pivotally mounted at their inner ends to said frame members atlocated in front of said rear axle, said boom sticks extendinglongitudinally of the tractor to points in advance of the front end ofsaid tractor and having an transversely extending reinforcing framemember therebetween located intermediate the forward ends of said boomsticks and the front end of the tractor, spaced pulleys mounted uponsaid reinforcing frame members, an articulated upright frame structurehaving its lower ends pivotally mounted upon the forward ends of thelongitudinal frame members, said upright frame structure extending abovethe top of the tractor,

a pair of upwardly inclined forwardly extending bucket pivotally mountedupon the forward end portions of the boom sticks, power operated elevatng means for said bucket and boom sticks carried by said boom supportsand including a substantially horizontal driven shaft, a friction clutchand brake device and a twin winding '5' drum mounted on said shaft androtatable therewith when power from the tractor is transmitted to saidshaft, means for transmitting power to said driven shaft, and cablemeans interconnecting said boom sticks and boom supports andinterconnecting adapted to be wound onto said drmn for lifting the boomsticks and dump bucket to an elevation approximating that of the forwardportions of the boom supports when said power operated means isactuated, said articulated upright frame structure comprising a lowerinverted substantially U-shaped portion adapted for rocking movementwith said longitudinal frame members when the tractor travels overuneven surfaces and a superimposed substantially A-shaped portionattached to the boom supports and adapted to remain stationary with saidsupports during the relative rocking movement of said lower frameportion.

2. A power shovel unit adapted to be mounted upon a tractor and operatedthereby, comprising articulated longitudinal frame members detachablyconnected to the front and rear axles of said tractor, a pair of boomsticks pivotally mounted at their inner ends to said frame members atpoints located in front of said rear axle, said boom sticks extendinglongitudinally of the tractor to points in advance of the front end ofsaid tractor and having an interconnecting transversely extendingreinforcing frame member therebetween located intermediate the forwardends of said boom sticks and the front end of the tractor, spacedpulleys mounted upon said reinforcing frame members, an articulatedupright frame structure having its lower ends pivotally mounted upon theforward ends of the longitudinal frame members, said upright framestructure extending above the top of the tractor, a

pair of upwardly inclined forwardly extending boom supports pivotallymounted at their inner ends to said longitudinal frame members at pointslocated behind the rear axle, said boom supports being pivotallyconnected adjacent their forward ends to said upright frame structure, atwin pulley device carried by and located between the boom supports at apoint in advance of the pivotal connection between said boom supportsand said upright frame structure, a dump bucket pivotally mounted uponthe forward end portions of the boom sticks, power operated elevatingmeans for said bucket and boom sticks carried by said boom supports andincluding a substantially horizontal driven shaft, a friction clutch andbrake device and a twin winding drum mounted on said shaft and rotatabletherewith when power from the tractor is transmitted to said shaft,means for transmitting power to said driven shaft, and cable meansinterconnecting said boom sticks and boom supports and adapted to bewound onto said drum for lifting the boom sticks and dump bucket to anelevation approximating that of the forward portions of the boomsupports when said power operated means is actuated, said articulatedupright frame structure comprisinga lower inverted substantiallyU-shaped portion adapted for rocking movement with said longitudinalframe members when the tractor travels over uneven surfaces and asuperimposed substantially A-shaped portion attached to the boomsupports and adapted to remain stationary with said supports during'therelative rocking movement of said lower frame portion, said upper andlower portions being detachably connected together and havinganti-friction moans located therebetween to facilitate the rockingmovement of the lower portion relative to the upper portion.

3. A power shovel unit adapted to be mounted upon a tractor and operatedthereby, comprising articulated longitudinal frame members detachablyconnected to the front and rear axles of said tract-or, a pair of boomsticks pivotally mounted at their inner ends to said frame membersatpoints located in front of said rear axle, said boom sticks extendinglongitudinally of the tractor to points in advance of the front end ofsaid tractor and having an interconnecting transversely extendingreinforcing frame member therebetween located intermediate the forwardends of said boom sticks and the front end of the tractor, spacedpulleys mounted upon said reinforcing frame members, an articulatedupright frame structure having its lower ends pivotally mounted upon theforward ends of the longitudinal frame members, said upright framestructure extending above the top of the tractor, a pair of upwardlyinclined forwardly extending boom supports pivotally mounted at theirinner ends to said longitudinal frame members at points located behindthe rear axle, said boom supports being pivotally connected adjacenttheir forward ends to said upright frame structure, a twin pulley devicecarried by and located between the boom supports at a point in advanceof the pivotal connection between said boom supports and said uprightframe structure, a dump bucket pivotally mounted upon the forward endportions of the boom sticks, power operated elevating means for saidbucket and boom sticks carried by said boom supports and including asubstantially horizontal driven shaft, a friction clutch and brakedevice and a twin winding drum mounted on said shaft and rotatabletherewith when power from the tractor is transmitted to said shaft,

means for transmitting power to said driven shaft, and cable meansinterconnecting said boom sticks and boom supports and adapted to bewound onto said drum for lifting the boom sticks and dump bucket to anelevation approximating that of the forward portions of the boomsupports when said power operated means is actuated, said articulatedupright frame structure comprising a lower inverted substantiallyU-shaped portion adapted for rocking movement with said longi tudinalframe members when the tractor travels over uneven surfaces and asuperimposed substantially A-shaped portion attached to the boomsupports and adapted to remain stationary with said supports during therelative rocking movement of said lower frame portion, said upper frameportion carrying anti-friction rollers adapted to ride on the adjacentsurface of the lower frame portion whereby to permit the relativerocking movement of the lower frame portion with respect to the upperframe portion.

4. A power shovel unit adapted to be mounted upon a tractor and operatedthereby, comprising longitudinal frame members detachably connected tothe axles of said tractor, boom sticks pivotally connected to saidlongitudinal frame members, a tiltable shovel mounted upon the outer endportions of said boom sticks, boom supports mounted at their rear endsto said longitudinal frame members and extending upwardly and forwardlybeyond the front end of said tractor, power operated means carried bysaid boom supports and connected to said boom sticks whereby to permitthe shovel to be elevated, means for transmitting power from the tractorto said power operated means for elevating the shovel, and anarticulated upright frame structure for supporting the boom supports inelevated position above said tractor, said articulated upright framestructure comprising a lower section mounted upon said longitudinalframe members and movable therewith during up and down movements of saidframe members and an upper section attached to said boom supports andmounted upon said lower section, said sections being detachablyconnected together and having anti-friction means interposedtherebetween to permit the rocking movement of the lower sectionrelative to said upper section.

5. A power shovel unit adapted to be mounted upon a tractor and operatedthereby, comprising articulated longitudinal frame members detachablyconnected to the axles of said tractor, boom sticks pivotally connectedto said longitudinal frame members, a tiltable shovel mounted upon theouter end portions of said boom sticks, boom supports mounted at theirrear ends to said longitudinal frame members and extending upwardly andforwardly beyond the front end of said tractor, power operated meanscarried by said boom supports and connected to said boom sticks wherebyto permit the shovel to be elevated, means for transmitting power fromthe tractor to said power operated means for elevating the shovel, andan articulated upright frame structure for supporting the boom supportsin elevated position above said tractor, said articulated upright framestructure comprising a lower section mounted upon said longitudinalframe members and movable therewith during up and down movements of saidframe members and an upper section attached to said boom supports andmounted upon said lower section, said sections being detachablyconnected together and having anti-friction means interposedtherebetween to permit the rocking movement of the lower sectionrelative to said upper section.

6. In a power shovel unit adapted to be mounted upon a tractor andoperated thereby, comprising longitudinal frame members detachablyconnected to the axles of said tractor, boom sticks pivotally connectedto said longitudinal frame members, a tiltable shovel mounted upon theouter end portions of said boom sticks, boom supports mounted at theirrear ends to said longitudinal frame members and extending upwardly andforwardly beyond the front end of said tractor, power operated meanscarried by said boom supports and connected to said boom sticks wherebyto permit the shovel to be elevated, means for transmitting power fromthe tractor to said power operated means for elevating the shovel, andan articulated upright frame structure for supporting the boom supportsin elevated position above said tractor, said articulated upright framestructure comprising a lower section mounted upon said longitudinalframe members and movable therewith during up and down movements of saidframe members and an upper section attached to said boom supports andmounted upon said lower section, said sections being detachablyconnected together and having anti-friction means interposedtherebetween to permit the rocking movement of the lower sectionrelative to said upper section, said longitudinal frame members having acounterweight mounted upon their rear end portionsv '7. A power shovelunit adapted to be mounted upon a tractor and operated thereby,comprising longitudinal frame members detachably connected to saidtractor, boom sticks pivotally connected to said longitudinal framemembers, a tiltable shovel mounted upon the outer end portions of saidboom sticks, boom supports mountedat their rear ends to saidlongitudinal frame members and extending upwardly and forwardly beyondthe front end of said tractor, power operated elevating means carried bysaid boom supports and connected to said boom sticks whereby to permitthe shovel to be elevated, means for transmitting power from the tractorto said power operated means for elevating the shovel, and an uprightframe having Side members converging toward their upper ends anddetachably connected to the boom supports for supporting the boomsupports in elevated position above said tractor, the side members ofsaid upright frame being detachably connected at their lower ends tosaid longitudinal frame members.

8. A power shovel unit adapted to be mounted upon a tractor and operatedthereby, comprising longitudinal frame members detachably connected tosaid tractor, boom sticks pivotally connected to said longitudinal framemembers, a tiltable shovel mounted upon the outer end portions of saidboom sticks, boom supports mounted at their rear ends to saidlongitudinal frame members and extending upwardly and forwardly beyondthe front end of said tractor, power operated elevating means carried bysaid boom supports and connected to said boom sticks whereby to permitthe shovel to be elevated, means for transmitting power from the tractorto said power operated means for elevating the shovel, and an uprightframe having side members converging toward their upper ends anddetachably connected to the boom supports for supporting the boomsupports in elevated position above said tractor, the side members ofsaid upright frame being detachably connected at their lower ends tosaid longitudinal frame members, said power operated elevating meansincluding a cable, a friction clutch and brake device and a windingdrum.

ADAM A. WALDECKER.

